Complete Guide to Matting Agents for Waterborne Coatings

What Is a Matting Agent?

A matting agent reduces the specular gloss of a coating film, producing surfaces that range from semi-gloss to dead-matte. In waterborne systems — which now dominate architectural, wood, and industrial coatings — achieving stable, low-gloss finishes is significantly more challenging than in solvent-based systems.

The two dominant chemistries are silica-based matting agents and wax-based matting agents, each with distinct advantages.

How Silica Matting Agents Work

Precipitated and fumed silica particles create microscopic surface roughness on the dried film. When light hits the surface, it scatters in multiple directions rather than reflecting in a single beam — the result is a matte appearance.

Key parameters to evaluate:

Mean particle size (d50): Finer particles (3–5 µm) produce better transparency; coarser particles (7–12 µm) give deeper matte with more haptic texture.
Oil absorption: Higher oil absorption means more binder consumption — important for high-PVC formulations.
Treatment type: Surface-treated silicas (wax-treated or organic-treated) improve anti-settling and compatibility in waterborne systems.

Common grades by application:

Application	Recommended d50	Treatment
Clear lacquer	3–5 µm	Wax-treated
Furniture topcoat	5–8 µm	Organic
Industrial floor	8–12 µm	Untreated

Wax-Based Matting Agents

Micronized waxes — typically polyethylene (PE), polypropylene (PP), or polytetrafluoroethylene (PTFE) wax — provide matting alongside scratch resistance and anti-blocking properties. They are often used in combination with silica.

PTFE wax gives the finest matte effect and the lowest coefficient of friction, making it ideal for high-end furniture and flooring where both gloss control and feel matter.

Waterborne-Specific Challenges

Waterborne coatings present unique obstacles:

Settling: Silica has a high tendency to settle in water-based systems. Pre-dispersed silica pastes or treated grades with steric stabilization address this.
Foam: High-shear dispersion of silica can generate foam. Pair with a silicone or mineral oil defoamer.
Transparency loss: Coarse silica or overdosing will haze clear coats. Start at 2–4% by weight and titrate up.
pH sensitivity: Some silica grades are sensitive above pH 9. Check compatibility with your binder system.

Dosage Guidelines

For a standard waterborne clear wood coating targeting 20–30 GU (60°):

Silica matting agent: 3–6% on total formulation weight
Optional PE/PTFE wax: 0.5–1.5% to boost scratch resistance

Always disperse under high shear (dissolver blade, 1500–2500 rpm) before let-down. Pre-dispersed aqueous slurries simplify this step.

Selecting the Right Matting Agent

Ask these questions before choosing:

Target gloss level — below 10 GU (matte), 10–35 GU (satin), or 35–70 GU (semi-gloss)?
Substrate — clear coat or pigmented? Tinted systems need finer silica to avoid graininess.
Haptic requirements — does the end-user need a silky, soft-feel, or dry touch?
Regulatory — food-contact, toy, or REACH compliance requirements?

Summary

Silica-based matting agents remain the industry standard for waterborne coatings. Pre-treated grades designed for aqueous systems simplify formulation significantly. For demanding applications combining matte appearance with functional surface properties, a hybrid silica + PTFE wax approach delivers the best results.

Contact Chemzip to request samples of our matting agent range for your specific waterborne coating system.